Electrical Conduction of Heart and EKG

Which part starts the first step in the electrical conduction system?

• sinoatrial node

• AV node

• AV Bundle branches

• Purkinge fibers

Which part would be second in the electrical conduction system?

• sinoatrial node

• AV node

• AV Bundle branches

• Purkinge fibers

Unlike skeletal mucle tissue which is also striated, cardiac muscle is branched. What does this allow?

• contraction of the entire heart in a coordinated way

• contraction of the heart in one direction

• contraction of the heart all at once

• contraction of the heart from side to side

Which part would be third in the electrical conduction system?

• sinoatrial node

• AV node

• AV Bundle (bundle if His)

• Purkinge fibers

Contraction of the ventricles is associated with what part of the electrical conduction system?

• sinoatrial node

• AV node

• AV Bundle branches

• Purkinge fibers

Diastole is associated with

• contraction of the heart

• relaxation of the heart

• myocardial infarction

• angina

What is a cardiac cycle?

• the number of beats per minute

• the volume of blood ejected with each left ventricular stroke

• everything that goes on in the heart from one heart beat to the next

• the ability of the heart to turn around

Which of the following is represents a cardiac cycle?

• PQRST

• QT interval

• QRS Complex

• PR Interval

Relaxation of the heart corresponds to

• T wave and baseline

• P wave

• QRS Complex

• PR Interval

On an ECG, the P wave represents __________________________.

• Contraction of the Atria

• Contration of the Ventricle

• The pause at the AV node

• The impulse traveling through the bundle branches